While its true that Federer can't say he was year end #1 for 6 years in a row. He was #1 consistently for 237 weeks, has more total weeks at #1, has more slams, and has more YECs.
Also lets not forget that Federer had the superior rival in Nadal. Not saying that Agassi is bad, but Nadal's idea of a good time isn't going hard on tweak
former college player, Head PT280 (and never looking back) volkl cyclone tour @54 lbs